Improvement in rotary engines



@2M i PATENTED- JUL 41871 UNITED STATES TENT OFFICE.

RAN SOME N. FRANCIS AND RUSSEL FRANCIS, OF GIRARD, PENNSYLVANIA.

IMPROVEMENT IN ROTARY ENGINES.

Specification forming part of Letters Patent No. 116,582, dated July 4,1871.

To all 'whom it may concern:

Be it known that we, RANsoME N. FRANCIS and RUSSEL FRANCIS, of Girard,in the county of Erie and State of Pennsylvania, have invented a new anduseful Improvement in Rotary Engines; and we do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to make and use the same, referencebeing had to the accompanying drawing forming part of thisspecification.

This invention relates to new and useful improvements in rotarysteam-engines, and consists in the construction and arrangement of partshereinafter described.

In the accompanying drawing, Figure 1 represents a sectional sideelevation, the section being taken on the line a: of Fig. 2. Fig. 2 is asectional elevation taken on the line 1/ y of Fie'. 1, showing a doublecylinder and the valve-motion.

Similar letters of' reference indicate correspon ding parts.

A is the bed-plate. B is the cylinder-casing attached to the bed, andheld stationary by the stands C C. D D are the cylinders, equal indiameter, and arranged side by side, as seen in Fig. 2. Each cylinderhas a single piston, and an induction and exhaust-valve. E E are theexhaustports, and F F the induction-ports. G G are the stea1n-chests. His a piston in each cylinder, one being seen in dotted lines. The modeof operating` the valves is seen in Fig. 2. I I are the double valvesthat is, an induction and exhaust-valve for each cylinder-operatedalternately by means ofthe eccentric grooves J J (on the shaft) and thelevers K K. L is an abutment foreach cylinder, operated by the eccentricgrooves m m. on the outer sides of the revolving piston-wheel N, thelatter being secured firmly to the shaft O. In Fig. l an abutment isseen closing one of the cylinders, and the piston in position for takingsteam. The abutment-s work alternately.

When one piston is operatin g under the pressure of steam the othercylinder is exhausting the steam, so that the steam pressure isconstant.

By this arrangement there can be no dead-centers, or no loss of powercaused thereby.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent- The arrangement of the steam-chests G G,valves I, abutments L, eccentric grooves J and m, casing B, piston-wheelN, and shaft O, substantially as and for the purposes described.

RANSOME N. FRANCIS. RUSSEL FRANCIS.

Witnesses IRA PICKETT, HENRY BALI..

